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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecee590ce75e923f7ce6cebbcf9642d33e7c0fc010441b46d940f025754ea32' 
  AND token = 'OjkqoQNlN3bjEV+mgBsdyAAY5Xa4Vca5HIOi/WwY1GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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