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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d25592cfd58ff5346895a48dc2e704b58a540f4f6762269ba2bd31136c1fcee' 
  AND token = 'AW755JkGoh9E+3xEEA5zNkwntTx9hxzzGg57r9Ib2Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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