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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccd56c2a15ca4c34e6294e648ff7be40a4c05a48c63e433c60b804b96f9110f' 
  AND token = 'l/qEh1dMvaMwc7QnV7Jz3VrW1Gv/ABSDOBrVxgUMsv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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