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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a23badb453c8ac625feb9dceb46cbcd69920215dcdcc7418a1e736b5816f19a' 
  AND token = '8cmB8Rly1/FxBIy4qoVuLNuZCadmeefwDtUGD8U6X38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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