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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d1f36fc41666f55a11fa42f515f22c414c4c742558e57832c9a8dd9967dd93' 
  AND token = 'EOk5a8SYSCxf2ApUWt4IadOgq/nit7VtvyrEDBIlzGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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