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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8785d2290fecee3d17c303a502b70ec47056c0e34f806d6ef96d18482e0156' 
  AND token = 'xuymiFpt4GMwlMhCMvDUnGLquc08DhTUh+n2GzF1t7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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