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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d15ccde189cf8a1e5a342f5b3774a7a88e6b3c80a00c6219bede3f68feaa295' 
  AND token = 'cgHx4J07lmURiM/gRx2vuh/Q7zN1mCZsmbEgoC1bZ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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