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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f23ec41f3f445012135663896b4b4f5a34d133c91b9200c1a5afb5246c70238' 
  AND token = 'axy+ZcGIToCg0J50ud84B6ODfxdhfoFWM6hssPMq2J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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