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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67e675cc08c8ca6e3704905986776c045e190e0a335853cbb6edd1b4434ea12' 
  AND token = '9dKGoh019u/4vdYpJmNseKON7ofq2G8IAbVBeC88a8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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