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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1084962e73994ee0a49ef04da0ba9acc8096e6557f99dafe1a4c309156db6bd8' 
  AND token = 'FKh8e2mtINWJxjCGkypm6YOTBhzBI0A7zpSwpwk6M5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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