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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9e5963c5603f7c1f76afd4796a92f713e449e1095e4aa33ff9eaf1fa18efd4' 
  AND token = 'CWWaBA50y7eGmzuyKz/eonXQC3khroQ8apR8qwAB3Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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