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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141ab109112ae2e07a452cf785b41d491befff4e430dc1e9c11f12bf1cec79a5' 
  AND token = 'jXmQgwMCSyMuU2nMjdJD7e6cc+UCIljcvg02qmKw8UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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