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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608c060e9cc28829feab25fcd00dc87adaca496b073c7c7be68d2cf3fc94c141' 
  AND token = '2ikdlLpoyvSD8c4v4jBYKsuXXp8rO9LMvSet/7w3VZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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