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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f77bbe0eb25c18c7f6fed579566829cdc466a99744d39970fd63d4ebdd60017' 
  AND token = 'OfbiMvDwQEGHnWzF2xFWhCR/ymLLr1ELeY2EZZ84GFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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