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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4baf1ff3376128cf0514c2787915f9e26abd2c1a21a05fa8ab41723d7bcf682c' 
  AND token = 'PeTvyO+WFXLv5A1tzPNw/HbL1of1ELjGng01oqAGZqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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