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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55376ae1a9a724741aa9f123f69aeecb50c0cec59bb85c4d536ea5c82d3a6ac1' 
  AND token = 'wITNuQ+H+Olt9bgc7d1WMFawVSRVoTXM2vN3b2RZmqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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