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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd5687eab1538a4a3dbdca58cf245acab27aa7f1ea54e818b65ce02efbedd6e' 
  AND token = 'eU8y82SO4yhhyH7kNnzMabd8B9wl9WT1zYWTFPrN6VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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