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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8949eb550fbf1dcf370313986a7c779f14a79d112b65a39ccb4a4027a484273' 
  AND token = '23roVgH5lS/Zl5HpG7JLGjgWDiVSMBM5Tce2dSR8FW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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