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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871509a7e5a9067d7470706d3ed4ba5b123c6c48937f511bed9a65bad4fc6a48' 
  AND token = 'o1eqzmr/m7ebjnpvf1eTdLCdkCZDcs6txTwtVe+ku2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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