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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d7e17e9eafee96eebf39412dda3d0af5106993e2b2a5d23d98b1f1e9aa6093' 
  AND token = 'IsT4jNCaxH7zb5KVCpmwy5hg6+ErOxNNF4kGzN5fCXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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