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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68a90e00de3e811870a77b2ee6e520caf157c40c206bf15296e5c1c13ac69d' 
  AND token = 'MNRww+KqIJG3ZKPvFR8dNEmJwaSrC4Xkh5FpeEE8sEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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