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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea29b94e2ba29e2d590b46cf5e6d414dde198017e9de13ae5953adf5d8edd1a1' 
  AND token = '80DC77DKjkSJ2sEp9lT1ej+1XfErBak88iUH5H+y2x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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