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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcf577281772c7146b8f75dd71822498d2c0d8480c95645c26fc98bf66ca92d' 
  AND token = 'U+XkG+kcNSSpvH0EGuzS41qQATEYz7Bx1qAm6m0/yzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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