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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86736d12c78cce6e1c5e16167ba59be697739e8e01a461b293247ae9311a8dec' 
  AND token = 'CkllIhQwbT7xzHPO1MPfcUY9V4XS2p3dChBQxe488Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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