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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf2a06f58b5510a4ac7a0a910e934246a2f8414c9b1a3ec9630d4c9bfdfa46d' 
  AND token = 'Kwnq6ufdzXiPEx3XzKxM91Me0JwqoSE8f3x6kMVeFzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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