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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f447e1f0f5f5ddf8dcc0a6f57edb6b41fb399f5f952d6d4a27791ea75cbd23af' 
  AND token = '+LK9AptwEG3YSNxYg4t+hR2FA0d5VcxQmZIHerLNxZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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