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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3bab33961c24da5da1239f77efe609ee7590d8402e5706d271bad7fe9018b2' 
  AND token = 'zW0QqtZwhURGrDi8xv7F1mgsR6HwU2uDwNShMU7tQVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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