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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec84636497732a193c13156096af10b4066de6aa5eba973860d212f8068b085' 
  AND token = 'xcdIjjYEEifp0IDDhuXJe0evCZIPOGd/ivG+8k65X0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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