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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0eef7e6f03e4bbe0bbdf77c0bb5e460b3c2f1b9cf4217241e37790a66e89ae' 
  AND token = '8byb2G8cYIotqS75o2dOuJRNzcj5SG15KXmPYm3ylVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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