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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e36e0a26c7bf265227a320c215fa170bd19b89c920df18ff891ec42d6bb9a' 
  AND token = 'Fx1YtYx5IJ+5JkLoVfLe73NG+dCJB/dvxJQ7QLkUD+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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