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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14ac3af509a9fa0535575251bc68384aad49dd183596df7f4030c9ff15f45a9' 
  AND token = 'mKPP0MicQNjTL67FhlzP1dQ3Bd0Q52tLqsQh1vGoimQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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