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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101a834e8ba675889b6ce41acbfa0b79091b235643eead68063ad1a369263b5d' 
  AND token = '4oyD32VkWljxxQj78gb/UeI8f67xH7WorI4NkuYTeHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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