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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75746aaf42288c0ad2dada989a3da889454a4ddc31c9a4541e2c7a0176b9aafb' 
  AND token = 'Uc6tilXJfriYg6dZJG5wN5+mrOVv9SeEk+o9qajduUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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