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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a6b802315d2bbb5654db1da73bb85884075ae985cfcbadb6e5a751a3722cf7' 
  AND token = 'GqGssuNYkeBvBcT/hOKXGIX3MT5RCUAMa5aM9g5VCsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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