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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc63ca8ec388013e2abd7ca832323ef1dff48b2268fe889a68591da91e3d30af' 
  AND token = 'u7ZowfTQKEPnJQszCcGRnDqmSDrO9ymKfBx/vcK6emE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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