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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5f7526071791e47978daa28ec43427e571085728e9a85296421b3ab60307d7' 
  AND token = 'xxnl0dkGvtv3hdPx4dauk4hWE9OJF7+U1ESPHEqn9lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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