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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b084a94550c955f84c2efa1a8758234513aed2c89fd6a0ea2e16fb5bb98b0fc' 
  AND token = 'gMLbQU1FUjpiGfNPWfVzV2iirf+63vlrLowswd4Fdpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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