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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdc53b9781f426cb7438b7542e96bf805d2b8770fdd91cc13afa73e95df6438' 
  AND token = '4rjW301Vkl3liDXs5s/cShopt+g6R01QHn21kjOGh+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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