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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e138a911d50b0be68f43b27ef04ded8dfd9bfb9d5739cf59fc2b934a6e99ea' 
  AND token = 'X2BK7VhZr+NLtesSIZKP95A6GBreZY3Axu76LuPxQog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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