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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a23b350b6697f28b9cabdf01c61ac3fddea21df9dea48a22839c34baf7929e3' 
  AND token = '0mCT2N5d+K/uQvS85A/oK79i6HtYXKgqa1Gf89WliXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}