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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbdb0cc21f065408040a2e110a4da4318261adce9a56d49c53c57a117281a3' 
  AND token = 'beMvqXlzSXl+j0G4uF7xqnL6jOJs9uiZPoTT662VrhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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