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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2881124c0afb1fb6049cce7f34009d5a0206cd1cdaf7e7907c7ec44f00ae0c' 
  AND token = 'NUYxtEBX1Ap9aBkquYUMhqzww1VTY/f/ZaXoVI6Vo+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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