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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738952f23a0f13d2e0f32d8af5230aff81ccd06c4787c786d926ee9bc6d4346c' 
  AND token = 'ncNduj6VSwSVPWIUaSKKMeO2Yw2b/59ZCfg5LBNFpwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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