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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cdaadb4e36151363d68c147492935e1ccd6daaab2663b8eb15259993d7b100' 
  AND token = 'ZCUqr4lKJrwg6c5ZbAkOt1lHXjl2idxqGWDFmgo/1zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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