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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dde7abcd3f4192a3276a87d2a431feae6874f395bab300068d3f659731b651' 
  AND token = '0ZGQ2Ys/7BU7G0e7HJRu74ehAFx/6i3w5XE+P99yfoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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