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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0323ce80e97115debfc358b0695b17a8c893a02c3ed1932283e8462e35c9fb52' 
  AND token = 'bnnC7AooAOePo7Zi0kSDZpIR938VTRtx6JR7bGGb8VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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