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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a8797cdf6e74c1775ab6833b810db7461c5935991236a988e3bc98d7d8b12e' 
  AND token = 'RWXpHrhoxUtAOqJQLX09XW2Dc9jFDUba7GNWClM9e0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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