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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b91c3548ae4fe39577309bf4cb004b94fca501164fc60268385c3e1d0d1273f' 
  AND token = '6zaFkkdbeqBDnP61sFy1ah3/KaqWDtf8HWVU9VxMteM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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