SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4b2920dde60fd7e4b8cbdb4655818c1f217354f2533e5512746b7998fe52b0' 
  AND token = 'A2HkJq65/wwWdCkewPDHjG+Ls3iyUcKs4UMR8geKmhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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