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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4cc6ddfc4a28273aa00dcff1b707c7f903450be0642aa5162057a37b6560e9' 
  AND token = 'A4qMnwhJ52laM53lSdRmKAf3W2x3ldlovSL9E7kXCwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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