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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52239bb88da502ba27875857c7f5cbb45743b0e1fb027bf39f61d7fc7243c48e' 
  AND token = 'XA/lgHyi4gyfH5AS1PpwbN6S+FWhJz50QWoWd+WqmYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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