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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd220ef0eda75a912ac888bfccf37c058fe4437341cfb1edbee193b4b7a222cb' 
  AND token = 'Xbfai9LZy+bFm+Mj6qW0B/cDGlygadihlxhIkCNrQgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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