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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a5c90c04362f0d77db82fea99b9ad3139acf8ed2ac95c1a05e4e97eed01046' 
  AND token = 'tLv0+3IQ4g3sdFLznZ4qNlgoltHRMa/gwUCTuUBI0zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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