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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad9d5ab3c4eabe04e8898dbe885649ebd982e0e0be534c84d0ff348ba41b481' 
  AND token = '5/9+WfeG9aHf9dS2HapXlkq1bGpnOtovsSV52ZOxP80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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