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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3739603e870c6549c9175b4b2565519ffd312b19a3392ceb57393014783277b6' 
  AND token = 'G5nIZ0vcpidmMgEMnSk3GCi6wXYs1gO2u6ziBh9Q1YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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