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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea70b6323ccf21a6e50fed9ac84921e80ad2a14742ac09c05ae179d615e8f11' 
  AND token = 'KSaAnemowNhUm0j1UlyZJ+G6iJt7IPCTIxyaQecrHnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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