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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba328497b791316857d7e5bb2e758f028b01f782bfab05ba1e7fdb9734f4113' 
  AND token = 'hFn8OH1i9wLkNCGmU2bMddiz/ifsoVde8KNLZ8LMt2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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