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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e190e951ef729d484dd17e02771132743448ff3c41cd1b440152ccc92009a600' 
  AND token = 'S/WyrP4L7IidfnDzd0SSiYMid54qIqC7fcRsC/flOYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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