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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac797f7635cfef2c12ef3f158e04509e0418997a242981a0983bafb93f92264b' 
  AND token = 'mW804iMI9O4L1L87ofAFvJ17bLYT19dhZy4bHza7uX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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