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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66809f699cb5771c065d77f7fb40eed58f7037aa74c849b222a773323b23091' 
  AND token = 'VoGDce3o5jaAL7l6PHzzLsAXdF/lJkRBSaUL+cS62lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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