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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61848d3d8550840e97238396863ccf5d08b674eb46f2f5279df7412d4a9c9bf3' 
  AND token = 'JhQ9oGBBZkOdIsnmycvsteA5v45ST6SGKBdcQ5cC/EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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