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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6157d1c615f2d53060d44a0a78069e7de5a0d08d2d6f0f8b3b491da223bd64' 
  AND token = 'e3yXVghKshcIZMllV+b4yxtBuLJTW2ghA+52fEp23SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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