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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb2ea7c140dd17b22158d83a0fd39f764b9cbdfee0d84434ecb624e2976b0a7' 
  AND token = '9G2sMR4aip/yVPz58E2zUqceavbipize3cplC32Fgyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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